4.L.B. Funding: The recommended budget was not met; the funding allocated to projects specific to this objective falls far short of the recommendation.

Progress: Only a small number of projects has been funded, and the intent of the objective has not been met to date. Research on siblings is still at an early stage, and the results, just beginning to be published, will inform future progress.

Remaining Gaps, Needs, and Opportunities: Results from studies within this objective will emerge in the near future. Greater understanding of the mechanisms underlying sibling development of ASD will be key before any targeted early interventions may be developed for this population.